Optimal error considerate cross-layer scheduler for heterogeneous users

Optimal error considerate cross-layer scheduler for heterogeneous users

For access to this article, please select a purchase option:

Buy article PDF
(plus tax if applicable)
Buy Knowledge Pack
10 articles for $120.00
(plus taxes if applicable)

IET members benefit from discounts to all IET publications and free access to E&T Magazine. If you are an IET member, log in to your account and the discounts will automatically be applied.

Learn more about IET membership 

Recommend Title Publication to library

You must fill out fields marked with: *

Librarian details
Your details
Why are you recommending this title?
Select reason:
IET Communications — Recommend this title to your library

Thank you

Your recommendation has been sent to your librarian.

A cross-layer scheduling algorithm that combines packet scheduling and an efficient bandwidth allocation for orthogonal frequency division multiple access (OFDMA) systems with heterogeneous user's delay requirements are proposed. The proposed work employs channel fluctuation and queue states in their decision rules for packet scheduling, which determines the optimum subcarrier allocation policy to maximise the system throughput subject to individual user's delay constraints. The delay sensitive subcarrier allocation strategy has linear complexity with respect to the number of users and number of subcarriers. The cross-layer scheduling algorithm also use an adaptive modulation and coding (AMC) scheme, which adapt according to the channel condition and queue states in terms of signal-to-noise ratio (SNR) constraints to improve the bandwidth usage in an efficient manner. The simulation results show that substantial throughput gain and spectral efficiency improvement are obtained while satisfying the delay constraint when the delay sensitive jointly optimum rate and subcarrier allocation policy with AMC is adopted.


    1. 1)
    2. 2)
    3. 3)
      • J. Jang , K.B. Lee . Transmit power adaptation for multiuser OFDM sytems. IEEE J. Sel. Areas Commun. , 2 , 71 - 178
    4. 4)
      • Kittipiyakul, S., Javidi, T.: `Resource allocation in OFDMA: how load balancing maximizes throughput when water-filling fails', UW Technical report UWEETR-2004-0007, 2004.
    5. 5)
      • Yeh, E.M., Cohen, A.S.: `Information theory, queuing, and resource allocation in multi-user fading communications', Proc. Information Sciences Syst. Conf., March 2004, p. 1396–1401.
    6. 6)
      • Yeh, E.M.: `Multiaccess and fading in communication networks', 2001, PhD, MIT, Department of Electrical Engineering and Computer Science.
    7. 7)
      • T.M. Cover , J.A. Thomas . (2006) Elements of information theory.
    8. 8)
      • D. Bertsekas , R.G. Gallager . (1992) Dual networks.
    9. 9)
    10. 10)
    11. 11)
    12. 12)
      • IEEE Standard 802.16 Working Group: ‘IEEE standard for local and metropolitan area networks. Part 16: air interface for Fixed broadband wireless access systems’ (Revision of IEEE Standard 802.16.2001), 2004.
    13. 13)

Related content

This is a required field
Please enter a valid email address